Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare destructiveHint=true and idempotentHint=false, so the safety profile is known. The description adds genuinely new context beyond them: the authorization requirement and the fact that removal takes effect immediately, implying no undo or confirmation window.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Two sentences, both load-bearing, with the trigger and the authorization constraint front-loaded. Nothing is redundant with the title or annotations.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

An output schema exists and annotations cover destructiveness, so the description need not explain return values or reversibility mechanics. It omits failure behavior (non-existent member, insufficient role) but covers what an agent needs to decide and call.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100% and all four parameters carry their own guidance, including which siblings supply each id, so the schema does the heavy lifting. The description adds nothing about the three mutually exclusive id alternatives, so the baseline 3 applies.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description names the resource (circle), the action (remove a member), and the initiating condition. It is clear and specific, though the verb is embedded in a trigger phrase rather than stated as an operation, and it does not explicitly distinguish itself from siblings like circles.update or circles.invites.create.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

It states the trigger ('when the human wants someone removed from a circle') and a hard prerequisite ('only circle owners and admins'). It stops short of naming alternatives or negative cases, e.g. that admins changing roles should use circles.update instead.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.